Question

A sample of 215Bi, which beta decays (t1/2 = 2.4 min), initially contains one-hundreth of Avogadro’s number of nuclei.
(a) What is the sample’s mass?
(b) Write down the beta decay equation and predict the product nucleus.
(c) How many bismuth nuclei are present after 10 min?
(d) After 1.0 h?
(e) What are the activities, in curies and becquerels, at these times?